Perhaps you should try some spelling variations:
thien hieu » thien nhien, thien chien, thien hue
tuong cong » truong cong, trong cong, tong cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
manh toan » thanh toan, anh tuan, tinh toan
va tuong » va thuong, va thong, xa truong
tam toan » tap toan, tam than, pham toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thien hieu lang - hanh hang va tuong cong ((tam toan) or (manh toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu lang - hanh hang va tuong cong ((tam toan) OR (manh toan)) ban.
• Adding a wildcard symbol may retrieve word variants: thien hieu lang - hanh hang va tuong cong ((tam toan) or (manh toan)) ban*.